Apparatus for crowning pulleys.



R. H. BOWEN. APPARATUS POR GBWNING PULLEYS. ArrLroA'rIon FILED JULY zo, 1910.v

1,047,737- Patend 1160.111912.

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APPLIOATION FILED JULY 20, 1910.

1,047,737, Patented De.17,1912.

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l www@ g uNirED-srATEs PATENT oiEioE.

RUSSELL H. BOWEN, or PALMYEA, NEW JERSEY, AssiGNoR To `'rHE AMERICAN PULLEY COMPANY, E PHILADELPH PENNSYLVANIA.

IA, PENNSYLVANIA, A CORPORATION f' AIEPAIRA'FU'Sv FOR CROWNING PULLEYS.

Application filed yJ'uly 20, 191,0. y SerialiNo. 572,808.

To all whom t may concern.' f kBe it known that I, RUSSELL I-I. BOWEN, of Palmyra, `in the county yof Burlington "and State of New Jersey, have invented certhe otherwise flat rim-is slightly beveled, on

each sidefof the median plane of thepulley, the region of greatest diameter, .toward which thebeveled surfaces converge, being at oradjacent to said median plane.

As frequently constructed, the rimy of a sheet inetalpulley isbuilt up from two flat cylindrical surface on the exterior. `The me dian plane above referred to, is that upon which the edges of these two ilatvbands meet.`

When the present invention is employed, the

periphery of the finished pulleyinay be said to consist substantially offtwo f rusta l of cones, having slight pitch, and having their bases in juxtaposition at or near the median plane of the pulley structure. n

In the accompanying drawings, I have f shown an apparatus embodying my invenferred for vcarrying out the same. Valso shownk a modified kformof apparatus,

tion in a preferred form, and illustrated certain stages of its usein the manner pre- I. have der certain circumstances, and in connection with these apparatus, I have showinl a pulley whose rim structure is of y the character. above referred to, but it must be understood i that such illustrations are t'o ,bef taken `as typical and not as restrictive.` rIn saiddrawings, Figure I, represents a horizontal sectional yview of one form4 of.

of said press, the plane of section being indi? cated at the line I,'I, in Fig; II. Fig. II, is

a view, partly in vertical central ysection and partly in side elevation, yof said Aform of press, `showing the part-s in theinitial position,` corresponding to the commencement 'of the process'. Fig. III, isav viewfpa'rtly in vertical section and partly inside elevation,`

of the mainelements of said forinof press in the position ycorresponding to thev completion of one stageof the process. ,Fig. IV, is a view in vertical central section of another form` offpress, yintended to be employed when sired. p

Referring to Fig.,II, 1, indicates the pulley, in its initial condition and ready for the crowning process, the rim portions being indicated respeotivelyfat 2, and 3, andthe median plane at 4. I preferably employ hydraulic pressure for eifecting thev neces-` a single stage processis de- Specincationof Letters Patent. Patented Dec. ,1912;` ,y

sary treatment, and in said drawings, 5, in- Y dicates the. body portion of the movable platen of a hydraulic press adapted kto be `actuated by means of .the plunger 6, oper ated the ordinary kmanner from a hy` drauliccylinder, which is not shown, as vits.

construction and mode-of operation are well understood. The stationary bed plate, or

rbase 7 of the press structure, is mountedin any convenient manner, adapted to resistV displacement. `To said base isattached, by means of the rigidrods 8, the top plate 9, of the press, which receives the thrust ofthe platen transmitted-through the pulleyunder treatment. s Said base also kcarries arplurality of rigidly mounted upright posts 10,y

which mayy be ofy squarev cross-section arranged symmetrically with relation to the platen, in` a manner which will be described later on. y,The body 5, of the platen is -preferably hollow, and lens-shaped, asshown,

havinga plurality of slots 11, arranged aty intervals corresponding with the positions of the posts 10, so as to permit the platen to clear said posts in its upward and downward movement. The plateny also comprises the die-holding ring 12, of considerablevertical depth, Said ring having its innerl surface coned, or flared outwardly, upward, as indicated at 13, vThe ring is secured in position .centrally upon the `body 5, preferably by means of screws 14, passing through the flange 15, which projects radially outward 18,19,20,*and`21, in thisinstance, siXlin y Y number, whose outer surfaces are conedy in,`

wardlyv downward in correspondence with theconed surfacel, of the holding ring, 12,

the pitch of said inner surfaces being that which is desired for the crowning or coning of the respective portions of the pulleys periphery, and being preferably less than the pitch of the outer surfaces of the segments. The arcs of these segments together constitute substantially a complete circle, there being a comparatively slight interspace left between the proximate ends of each pair, which interspace however, is of such a small extent as to be negligiblein its effect upon the metal of the pulley, while yet preventing the segments from jamming too closely together under pressure. Then arranged in position within the holding ring 12, the diesegments form an internally coned annulus whose lower edge extends inward so as to overhang the tops of the posts 10, the joints between the respective pairs of segments being preferably located in correspondence with said posts. The platen is also provided with auxiliary hydraulic cylinders 23, and 24, having plungers 25, and 26, respectively, which are adapted to depress the platen after the cessation of its upward movement. The top plate 9, of the press may conveniently be formed with a central aperture 2S, through which a suspension device, such as a rope 29, may pass in order to support the pulley in position at the commencement of the operation. Such being the structure of the apparatus in this form, I will now proceed to describe the process which is conducted by means thereof.

The platen 5, being in its lower position, as sho-wn in Fig. II, and the segments 16 to 21, inclusive, being arranged symmetrically within the holding ring 12, the pulley 1, is suspended co-axially with the said ring by means of the rope, or other supporting device 29, and is held thereby against the under side of the top plate 9, so as to prevent accidental lateral displacement. Hydraulic pressure being then applied, the platen moves upward and the lower edge of the pulley rim is received symmetrically within the upper extremity of the conical opening, formed by the combined die segments, the diameter of said opening corresponding substantially with the external diameter of said edge, As the upward movement of the platen continues, the segments are forced over and upon the lower half of the pulleys periphery, bending and compressing the metal thereof radially inward, so that its external surface conforms in pitch to the internal surface of the combined die segments. This upward movement continues until the top of the segmental die reaches the median plane of the pulley, the' position at this stage of the process being that shown in Fig. III. The hydraulic pressure upon the plunger 6, is then released and the plungers 25, and 26, are operated to cause the descent of the platen, carrying with it the pulley, whose suspending device 29, is now temporarily released. As the downward movement of the platen continues, the lower surfaces of the die segments come into contact with the posts 10, and the further continued movement forces the segmental die upward, with the lower half o-f the pulley in their embrace, so as to disengage the segmental die from the holding ring 12. This disengaging movement is readily permitted by reason of the considerable flare or pitch of the external surfaces of the segments. As soon as the die segments have been raised a slight distance and are thus loosened, the pulley can be readily freed from them, and the operation of crowning the lower half of the pulley is now complete. `The pulley is then turned upside down, and the process is repeated upon the remaining half of the peripheral surface, which is thus coned insymmetry with the other half, so that the result is to produce the desired crowning of the peripheral surface as a whole.

Referring now to Fig. IV, I have there shown an apparatus which is adapted to permit the simultaneous crowning lof both sides of the pulley rim, as distinguished from the successive operations above described. In said figure, 30, represents the platen, and 31, the top plate of the press, having actuating and holding devices similar in general character to those just described. The platen 30, is provided with a die-holding ring and segmental dies, similar in character to those above specified, (and which may conveniently be termed the lower die-holder, and lower segmental dies,) and the top plate is provided with a downwardly depending die-holding ring 32, which I term the upper die-holder, and which is o concentric with the lower dieholder. Within the upper die-holder 32, are arranged a plurality of upper die segments 33, similar in character and general construction to those of the lower segment-al die and retained elastically in position by means of downwardly depending rods 35, and springs 36, the tension of said springs holding the upper die segments in place against the action of gravity. lVhen this form of press is used, the pulley is centered and held as before stated, and upon the upward movement of the platen both the upper and lower dies are progressively forced upon the rim in opposite directions, bending and compressing the metal thereof so as to crown both sides simultaneously. When the crowning operation is complete and the return movement of the platen takes place, the first effect (due to the action of gravity) isr to withdraw the upper segment-al die from its seat within the upper die-holder, this action being permitted by the elastic retaining devices. As soon however, as the upper die segments have been freed from the embrace of their holding element, they caii readily f thereof. Thus, for instance, I do not limit particular means of affording the necessaryV pressure for the dies, nor yto the exactY ar= 'rangement ofthe cooperating moving elemy claims to the use of any particular number of die segments, nor to the use ,of any ments whereby the pressure is applied.

I claim i f `l. In an apparatus comprising a platen,

a top plate; and means `for moving one of` said elements with relation tothe other, the

combination of, a die-holdingfelemeiit, 'hav' iiig a 'coned internal surface; vand' a plu-v rality of die-segments having 'their eXter- 4 nal surfaces coned in conformity with the internal surface of the holding element, said die-segments having coned internaly surfaces, and being adapted to form substantially a complete aniiulus, whenk arranged within said holding element.

2. lIn an apparatus ycomprising *avr platen, atop plate, and means formoving one lof said elements with relation to theother, the.

combination of a die-holding element,hav ing a coned internal surface; a plurality'` of die-segments having their ,external surfaces rconed in conformity with-the internal sur face of the holding element, said die-segments having also 4coned internal surfaces; l yand means for freeing the dies from the holding element upon the return movement of the pressing device.

combination of upper and lower die-holding elements, having coned, internal surfaces and respectively carried-by said yplaten and said top plate; two sets ofdie-segnients having coned internal surfaces and coned eX- ternal surfaces and carried respectively by said vdie-holding elements; means for elastically retaining the die-segments in the up-k per die-holder; and means for freeing they Ylower die-segments, upon the return movement of the platen, substantially as set forth.

t. In a press provided with a suitable source vof'power, the combination of a fixed v base plate; "upright posts arranged upon said base plate; a xed top plate; a movable platen arranged between said base and said top plate; andslotted toy permit movement with/relation to said posts; a holdin ele@ `1iient,lcarried by said platen, said lio ding ring'having a flared vinternal surface; ay i pluralityfof die-segments having their eX- ternal 'surfaces coned in conformityV with the internal surface of the holding element and having" their yinternal surfaces also coned, the lower edges of said diebeiiig ar-A ranged in the described relation to said posts, whereby upon the return movement of thel platen, said die segments will engage .'with the upperextremities of the posts, substantially as and for the purposeset forth.

In testimony whereof, I have hereunto signed myv name, at Philadelphia, Pennsyl vania, this yfifteenth day of July, 1910.

s RUssELL H. Bowirii.y

Witnesses: v

JAMES H. BELL, E. L. FULLnR'roN.

Copies fof this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. C3 f yso c l 45 e 3. In an apparatus comprising a platen, e

a top plate, andy means for moving one of` said elements with relation to the other, the 

